I've actually seen some concept art somewhere of early enclave uniforms and they had a very national socialist undertone.
Yes I realize that the enclave were just against anyone who differed from them but I like my justification better than "you're different, into the fire!" given the choice of whether or not to turn the key to annihilation I would need more info, the thing about local rad levels is a good point, I'd also want to know the full extent of effects survivors suffered due to radiation exposure and -of course- if a lot of these could be treated.
I'd be more likely to side with one of the branch-offs of the enclave -the ones who seriously want to rebuild the world-.... I hope their uniforms are as snazzy as the east coast enclave's. xD